Tool holder



FIG. 1 is an isometric view of the design;

FIG. 2 is an enlarged top view of the design;

FIG. 3 is an enlarged bottom view of the design;

FIG. 4 is an enlarged front elevation view of the design, the rear elevation view being identical thereto; and,

FIG. 5 is an enlarged side elevational view of the design, with the other side being a mirror image thereof. 

The ornamental design for a tool holder, as shown and described. 